3. 应保持室内
风，少去人多不风
场所。
3.Should be kept indoor ventilation, to people less unventilated places.
风,
不流畅3. 应保持室内风，少去人多不风场所。
3.Should be kept indoor ventilation, to people less unventilated places.
They found that in unventilated spaces levels can build up and, over time, cause health problems such as allergies and asthma.
研究表明，在不透风
间里，时间长了，会影响健康，出现过敏、哮喘等症状。
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